Formal regions are those that are designated by official boundaries, such as cities, states, counties, and countries. For the most part, they are clearly indicated and publicly known.
Functional regions are defined by their connections. For example, the circulation area for a major city newspaper is the functional region of that paper.
Vernacular regions are perceived regions, such as "The South," "The Midwest," or the "Middle East;" they have no formal boundaries but are understood in our mental maps.
"Theme 5 Region" - Brought from Mr. Plouffe's Wikispace Maps
"Theme 5 Region" - Brought from Mr. Plouffe's Wikispace
Maps
by Sangwoo Song